533
FNCA52 TJSJ 170830
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
430 AM AST SAT APR 17 2021
DISCUSSION
A SAHARAN AIR LAYER WILL CAUSE HAZY SKIES AND
LIMITED SHOWER ACTIVITY ACROSS THE ISLANDS THROUGH THE WEEKEND.
AN OVERALL DRYING TREND IS EXPECTED AND RELATIVE HUMIDITIES COULD
REACH CRITICAL FIRE WEATHER THRESHOLDS TODAY AND ESPECIALLY ON
SUNDAY. EAST TO SOUTHEAST WINDS COULD BRING SOME SHALLOW MOISTURE
CONTENT EARLY IN THE MORNING HOURS ACROSS THE SOUTHERN AND
EASTERN COASTAL AREAS OF PR TODAY, HOWEVER, DRIER CONDITIONS ARE
EXPECTED DURING THE LATE MORNING AND EARLY AFTERNOON HOURS. WINDS
TODAY SHOULD RANGE BETWEEN 10-15 MPH IN GENERAL, WITH HIGHER GUSTS
DUE TO THE SEA BREEZE. THEREFORE, THERE IS AN ELEVATED FIRE DANGER
POTENTIAL TODAY FOR THE SOUTHERN COAST OF PR.
PRZ014-180830-
SOUTHEAST COASTAL PLAINS-
430 AM AST SAT APR 17 2021
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10
TEMP (24H TREND) 87 (-2) 72 (-3) 89
RH % (24H TREND) 55 (+5) 84 (-2) 46
20FTWND-VAL/AM(MPH) E 9 E 10
20FTWND-RDG/PM(MPH) SE 10 E 5 SE 11
MIXING HGT(FT-AGL/MSL)5143 5254
TRANSPORT WND (MPH) SE 13 SE 15
VENT RATE (KT-FT) 53904 68402
DISPERSION 5 5
DSI 5 3 6
LAL 1 1 1
HAINES INDEX 3 4 3
REMARKS...NONE.
PRZ015-180830-
SOUTHERN HILLS-
430 AM AST SAT APR 17 2021
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 10
TEMP (24H TREND) 87 (+1) 70 (-1) 88
RH % (24H TREND) 51 (0) 86 (-5) 45
20FTWND-VAL/AM(MPH) SE 8 E 9
20FTWND-RDG/PM(MPH) SE 9 SE 5 SE 10
MIXING HGT(FT-AGL/MSL)6631 6612
TRANSPORT WND (MPH) SE 12 SE 14
VENT RATE (KT-FT) 63141 73951
DISPERSION 5 5
DSI 5 3 6
LAL 1 1 1
HAINES INDEX 3 4 3
REMARKS...NONE.
PRZ016-180830-
NORTH COASTAL PLAINS-
430 AM AST SAT APR 17 2021
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 10
TEMP (24H TREND) 91 (+5) 72 (-3) 92
RH % (24H TREND) 49 (-4) 85 (+1) 43
20FTWND-VAL/AM(MPH) E 6 E 7
20FTWND-RDG/PM(MPH) E 8 SE 5 E 10
MIXING HGT(FT-AGL/MSL)6511 6251
TRANSPORT WND (MPH) E 10 E 13
VENT RATE (KT-FT) 71887 80201
DISPERSION 5 5
DSI 5 3 5
LAL 1 1 1
HAINES INDEX 3 4 4
REMARKS...NONE.
PRZ017-180830-
NORTHERN HILLS-
430 AM AST SAT APR 17 2021
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 10 20
TEMP (24H TREND) 90 (+4) 69 (-3) 91
RH % (24H TREND) 47 (-1) 89 (+2) 40
20FTWND-VAL/AM(MPH) E 5 E 5
20FTWND-RDG/PM(MPH) NE 6 LGT/VAR E 6
MIXING HGT(FT-AGL/MSL)6860 7838
TRANSPORT WND (MPH) SE 7 E 8
VENT RATE (KT-FT) 48843 79417
DISPERSION 5 5
DSI 5 2 5
LAL 1 1 1
HAINES INDEX 3 4 3
REMARKS...NONE.
PRZ018-180830-
WEST COAST-
430 AM AST SAT APR 17 2021
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 10
TEMP (24H TREND) 89 (+2) 73 (-2) 91
RH % (24H TREND) 52 (+1) 87 (+3) 46
20FTWND-VAL/AM(MPH) E 7 E 7
20FTWND-RDG/PM(MPH) SE 9 E 5 E 8
MIXING HGT(FT-AGL/MSL)5646 5672
TRANSPORT WND (MPH) SE 12 SE 13
VENT RATE (KT-FT) 63635 77641
DISPERSION 5 5
DSI 5 4 6
LAL 1 1 1
HAINES INDEX 3 4 4
REMARKS...NONE.
PRZ019-180830-
EASTERN INTERIOR-
430 AM AST SAT APR 17 2021
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 10
TEMP (24H TREND) 91 (+4) 70 (-2) 90
RH % (24H TREND) 45 (-7) 87 (-6) 40
20FTWND-VAL/AM(MPH) SE 7 SE 9
20FTWND-RDG/PM(MPH) SE 10 SE 6 SE 10
MIXING HGT(FT-AGL/MSL)7141 7269
TRANSPORT WND (MPH) SE 12 SE 14
VENT RATE (KT-FT) 69550 76103
DISPERSION 5 5
DSI 5 3 6
LAL 1 1 1
HAINES INDEX 3 5 3
REMARKS...NONE.
PRZ022-180830-
LUQUILLO MOUNTAIN RANGE-
430 AM AST SAT APR 17 2021
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 10
TEMP (24H TREND) 85 (+5) 67 (-2) 85
RH % (24H TREND) 56 (-9) 90 (-8) 52
20FTWND-VAL/AM(MPH) SE 8 SE 9
20FTWND-RDG/PM(MPH) SE 10 SE 6 SE 10
MIXING HGT(FT-AGL/MSL)4638 4984
TRANSPORT WND (MPH) SE 13 SE 15
VENT RATE (KT-FT) 49046 66861
DISPERSION 5 5
DSI 6 4 6
LAL 1 1 1
HAINES INDEX 3 5 3
REMARKS...NONE.
PRZ023-180830-
CENTRAL MOUNTAIN RANGE-
430 AM AST SAT APR 17 2021
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 20
TEMP (24H TREND) 89 (+5) 67 (-2) 91
RH % (24H TREND) 45 (-2) 89 (0) 39
20FTWND-VAL/AM(MPH) SE 6 SE 7
20FTWND-RDG/PM(MPH) SE 6 LGT/VAR SE 7
MIXING HGT(FT-AGL/MSL)7247 8455
TRANSPORT WND (MPH) SE 9 E 8
VENT RATE (KT-FT) 61155 66590
DISPERSION 5 5
DSI 5 2 5
LAL 1 1 1
HAINES INDEX 3 4 3
REMARKS...NONE.
PRZ024-180830-
CAYEY MOUNTAIN RANGE-
430 AM AST SAT APR 17 2021
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 20
TEMP (24H TREND) 87 (+4) 69 (-1) 85
RH % (24H TREND) 53 (-5) 85 (-12) 48
20FTWND-VAL/AM(MPH) SE 8 SE 9
20FTWND-RDG/PM(MPH) SE 10 SE 5 SE 10
MIXING HGT(FT-AGL/MSL)5249 5381
TRANSPORT WND (MPH) SE 12 SE 14
VENT RATE (KT-FT) 56625 69523
DISPERSION 5 5
DSI 5 3 6
LAL 1 1 1
HAINES INDEX 3 4 3
REMARKS...NONE.
PRZ025-180830-
VIEQUES-
430 AM AST SAT APR 17 2021
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 20
TEMP (24H TREND) 86 (+1) 76 (0) 84
RH % (24H TREND) 59 (-4) 81 (-7) 59
20FTWND-VAL/AM(MPH) SE 11 E 11
20FTWND-RDG/PM(MPH) SE 9 SE 8 E 11
MIXING HGT(FT-AGL/MSL)2928 3906
TRANSPORT WND (MPH) SE 9 SE 17
VENT RATE (KT-FT) 24390 58590
DISPERSION 5 5
DSI 6 6 6
LAL 1 1 1
HAINES INDEX 3 5 4
REMARKS...NONE.
PRZ026-180830-
CULEBRA-
430 AM AST SAT APR 17 2021
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 20
TEMP (24H TREND) 86 (+2) 76 (-1) 86
RH % (24H TREND) 61 (-6) 81 (-6) 59
20FTWND-VAL/AM(MPH) SE 13 E 12
20FTWND-RDG/PM(MPH) SE 12 G19 SE 10 E 12
MIXING HGT(FT-AGL/MSL)2971 3318
TRANSPORT WND (MPH) SE 12 SE 17
VENT RATE (KT-FT) 30094 50831
DISPERSION 5 5
DSI 6 6 6
LAL 1 1 1
HAINES INDEX 3 5 4
REMARKS...NONE.
PRZ027-180830-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
430 AM AST SAT APR 17 2021
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE NONE NONE
CHANCE PRECIP (%) 0 0 0
TEMP (24H TREND) 88 (0) 73 (-3) 88
RH % (24H TREND) 52 (0) 86 (+2) 47
20FTWND-VAL/AM(MPH) E 11 E 11
20FTWND-RDG/PM(MPH) SE 12 E 8 SE 12
MIXING HGT(FT-AGL/MSL)5113 5199
TRANSPORT WND (MPH) SE 17 SE 18
VENT RATE (KT-FT) 69995 83429
DISPERSION 5 5
DSI 6 5 6
LAL 1 1 1
HAINES INDEX 3 4 4
REMARKS...NONE.
VIZ001-180830-
SAINT THOMAS AND SAINT JOHN-
430 AM AST SAT APR 17 2021
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 20
TEMP (24H TREND) 85 (+1) 74 (-1) 85
RH % (24H TREND) 60 (-4) 82 (-8) 59
20FTWND-VAL/AM(MPH) SE 13 SE 13
20FTWND-RDG/PM(MPH) SE 12 SE 9 SE 12
MIXING HGT(FT-AGL/MSL)2857 3275
TRANSPORT WND (MPH) E 10 E 18
VENT RATE (KT-FT) 28040 52400
DISPERSION 5 5
DSI 6 6 6
LAL 1 1 1
HAINES INDEX 4 5 4
REMARKS...NONE.
VIZ002-180830-
ST CROIX-
430 AM AST SAT APR 17 2021
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 20
TEMP (24H TREND) 86 (+1) 73 (-1) 86
RH % (24H TREND) 55 (-7) 86 (-5) 56
20FTWND-VAL/AM(MPH) SE 12 E 12
20FTWND-RDG/PM(MPH) SE 11 E 9 E 11
MIXING HGT(FT-AGL/MSL)4392 5101
TRANSPORT WND (MPH) SE 16 SE 18
VENT RATE (KT-FT) 58486 79390
DISPERSION 5 5
DSI 6 6 6
LAL 1 1 1
HAINES INDEX 4 5 4
REMARKS...NONE.
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